After formatting hard drive and reinstalling Windows, can't activate it.?

Formatting and re-installing everything will get rid of any viruses or malware, except for an MBR virus. To get rid of every potential viruses, you should completely remove the partition before trying to install Windows again. Chances are, the slowness is simply a bunch of crapware that loads on reboot.

Most people accumulate crapware and don't even realize it. Things that run in the background automatically after rebooting, like printer monitors, media player quick launchers, unused drivers for equipment you don't even own anymore, weather bugs, etc... they all slow the computer down. Reinstalling from scratch will clean up all that junk and make the computer as fast as it was when new.

I seriously doubt its a hardware issue, as most RAM and CPU problems show up as complete failures, not allowing any booting of the computer at all.

No need to format your hard drive if the problem can be solved without it, actually the registry of your operating system needs to clean, This type of problem occurs when registry is overloaded with irrelevant information and corrupted files so it is necessary to clean and fix the errors, this can be done manually but depends if you have some know how to sort out the corrupted files, or use PC optimizer registry repairer software like Reginout.

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